<template>
    <Select
            @dropdownVisibleChange="handleFetch"
            v-bind="$attrs"
            @change="handleChange"
            :options="getOptions"
            v-model:value="state"
    >
        <template #[item]="data" v-for="item in Object.keys($slots)">
            <slot :name="item" v-bind="data || {}"></slot>
        </template>
        <template #suffixIcon v-if="loading">
            <LoadingOutlined spin />
        </template>
        <template #notFoundContent v-if="loading">
      <span>
        <LoadingOutlined spin class="mr-1" />
        {{ t('component.form.apiSelectNotFound') }}
      </span>
        </template>
    </Select>
</template>
<script lang="ts">
    import { defineComponent, PropType, ref, watchEffect, computed, unref, watch } from 'vue';
    import { Select } from 'ant-design-vue';
    import { isFunction } from '/@/utils/is';
    import { useRuleFormItem } from '/@/hooks/component/useFormItem';
    import { useAttrs } from '/@/hooks/core/useAttrs';
    import { get, omit } from 'lodash-es';
    import { LoadingOutlined } from '@ant-design/icons-vue';
    import { useI18n } from '/@/hooks/web/useI18n';
    import { propTypes } from '/@/utils/propTypes';

    type OptionsItem = { label: string; value: string; disabled?: boolean };

    export default defineComponent({
        name: 'ApiSelect',
        components: {
            Select,
            LoadingOutlined,
        },
        inheritAttrs: false,
        props: {
            value: [Array, Object, String, Number],
            numberToString: propTypes.bool,
            api: {
                type: Function as PropType<(arg?: Recordable) => Promise<OptionsItem[]>>,
                default: null,
            },
            // api params
            params: {
                type: Object as PropType<Recordable>,
                default: () => ({}),
            },
            // support xxx.xxx.xx
            resultField: propTypes.string.def(''),
            labelField: propTypes.string.def('label'),
            valueField: propTypes.string.def('value'),
            immediate: propTypes.bool.def(true),
        },
        emits: ['options-change', 'change'],
        setup(props, { emit }) {
            const options = ref<OptionsItem[]>([]);
            const loading = ref(false);
            const isFirstLoad = ref(true);
            const emitData = ref<any[]>([]);
            const attrs = useAttrs();
            const { t } = useI18n();

            // Embedded in the form, just use the hook binding to perform form verification
            const [state, setState] = useRuleFormItem(props, 'value', 'change', emitData);

            const getOptions = computed(() => {
                const { labelField, valueField, numberToString } = props;
                return unref(options).reduce((prev, next: Recordable) => {
                    if (next) {
                        const value = next[valueField];
                        prev.push({
                          ...omit(next, [labelField, valueField]),
                          label: next[labelField],
                          value: numberToString ? `${value}` : value,
                        });
                    }
                    return prev;
                }, [] as OptionsItem[]);
            });

            watchEffect(() => {
                props.immediate && fetch();
            });

            watch(
                () => props.params,
                () => {
                    !unref(isFirstLoad) && fetch();
                },
                { deep: true }
            );

            async function fetch() {
                const api = props.api;
                if (!api || !isFunction(api)) return;
                options.value = [];
                try {
                    loading.value = true;
                    const res = await api(props.params);
                    if (Array.isArray(res)) {
                        options.value = res;
                        emitChange();
                        return;
                    }
                    if (props.resultField) {
                        options.value = get(res, props.resultField) || [];
                    }
                    emitChange();
                } catch (error) {
                    console.warn(error);
                } finally {
                    loading.value = false;
                    //--@updateBy-begin----author:liusq---date:20210914------for:判断选择模式，multiple多选情况下的value值空的情况下需要设置为数组------
                    unref(attrs).mode == 'multiple' && !Array.isArray(unref(state)) && setState([])
                    //--@updateBy-end----author:liusq---date:20210914------for:判断选择模式，multiple多选情况下的value值空的情况下需要设置为数组------
                }
            }

            async function handleFetch() {
                if (!props.immediate && unref(isFirstLoad)) {
                    await fetch();
                    isFirstLoad.value = false;
                }
            }

            function emitChange() {
                emit('options-change', unref(getOptions));
            }

            function handleChange(_, ...args) {
                emitData.value = args;
            }

            return { state, attrs, getOptions, loading, t, handleFetch, handleChange };
        },
    });
</script>
